year

Y (billion)

Predicted value (billion)

relative error

2008

2767.726

2590.408

0.064066

2009

2900.533

2776.138

0.042887

2010

3197.46

3068.92

0.040201

2011

3896.959

3716.852

0.046217

2012

4231.038

4099.892

0.030996

2013

4712.732

4701.812

0.002317

2014

5185.961

5178.577

0.001424